Resistant-surface alloy of iron



r ..facture.

25 loys in iron by virtue entire mass,

3 agencies ten hPatented Apr. 28, 1925. I

"1 1,535,764 D-" S A ESI AT NTFiona-cs.

a GEORGE E. xam, or oen'ron, 031e,, nssrenon T UNITED ALLOY STEEL con :PQRATIQMOF omen, Mario, A

coaroa'arron or NEW YORK.

.. nnsrsrrmr s unrecnatioy or mom.

' .This invention relates toiron alloys. One of .the objects thereof is to provide an alloy. 9 of iron having a. surface adapted to with? V stand theefi'ect of moisture or. other agents withoutchange,

.Another object is to provide an alloy of the above nature which will be strong and tough, andyet readily worked. Qther objects will be in part obvious or in H part pointed out hereinafter.

The invention accordingly consists the features and combinations of ,con stituents,-. all as will'be illustratively herein described 5 the scope of the application of which.

will be pointed out. in the appended claims.

It may first be noted that the term iron alloy is used in a broad sense to cover al which'carbon present, according as it is or is not specified,

and .thus to include compositions whichmight with carbon, present: be more s'pecifi 'cally termed a steel alloy. It is also to be understood that by :theexpression re.

: sistant surfaoe. is-meant a quality of the of which it, throughout its which strongy resists the effect. of any e otherwise alter the same. noted at this point that in the alloys hereinafter described-phosphorus, sulphur and "like elements are usually present, as in the 0 case of ordinary commercial iron and steel, but that these elements are, to be kept as 1 "low as possible; i

' Considering now an illustrative embodithis invention, I have found the followlng composition to give excellent -rement of sults: copper fron1 40% to .60%, 'molyb- 5 denumfrom .05%-to 12%, chromium from' 16.0% to 20.0%, and silicon from 1.0% .to 2.5%. Carbon, if present, is preferably 1 kept low',-and by'th'is is meant, in this connect'ion', that it is.- preferabl Y substantiall below'.20%. v y

. I .Both the copper and molybdenumarealso daf -joint eifect be'tter States, anda resident Alloys of Iron, of which-the ,b

and capable'ofready manu-' may or may not be prising, in combination with is adapted to present ,a surfacetocorrode, discolor, or

=It' may also be "mrum from 3.0%

;.05 -to -.'20'%, 25.0%, carbon ,inan amount not exceeding. 20%,, and silicon from .50'% to 5.00%.

best.results,-in small quantities, of iron com-' I v I Application: filed April 14,1924. S eria1 N'o. 706,565..

and it" is .to benoted that they have a conto a marked degree than without the other.

a general results are attained b on, chromium, silicon an that of either used :I have found as lent using the caran aggregate am 25.0 01 of the total.

invention.

molybdenum in o-unt of from"- 15.0% to rule thateXceL The ranges" above specified are, o f c'ourse, sub ect/to considerable variation without the .loss of much of the beneficial effect in this' .There i's preferablyincluded in the alloy a; small amount, of vanadium, say, from .10% to .'50%,as a scavenging agent.

The various alloying elements are so added, preferably'with. the iron-in molten 1 form, that they willbe thoroughly diffused throughoutthe mass.

. By alloys such as above described the deslred'character'of surface is attained and yet they are readily worked, particularly if the, carbon is kept. low. Also, IIQQSPGClfll heat treatment isrequired.

inthe embodiment of my'invention above As a' number of variations might be made set forth, it is to be understood that all matter herein described is to be interpreted as illustrativeand not in a limiting sense. .I-claim as my inventionz f 1. A' resistant surface alloy of iron comprising, in combination with the iron, copper from .'15%"-to 2.0%, molybdenum from 05% to. 20%, chromium from 3.0% bon in an amount notexceeding 20%, and silicon from 5.0% to 5.00%. 5 r

4.;A resistant-surface alloy of'liron comthe iron, chroto 30.0%, silicon from -copper from .10% to 2.0%,

to 25.0%, carprising','in combinationwith the iron, cop

per from .15% to 2.0%,

chromium, .from 16.0% to 5. Av resistant-surface alloy molybdenum .from- I 96: .3. A -resistant-surfacealloy of iron eomw per from 40% to .60%,

prising, in combination with the iron, copper from .15% to 2.0%, molybdenum from .05% to chromium from 3.0% to 25.0%, carbon in an amount not exceeding .10%, and silicon from .50% to 5.00%.

6. A resistant-surface alloy of iron comprising, in combination with the iron, copfrom .15% to 2.0%, molybdenum from per 05% to 20%, chromium from 3.0% to 25.0%, silicon from 1.0% to. 1.0%, and carbon in an amount not exceeding 20%.

7. A resistant-surface alloy of iron comprising, in combination with the iron, copper from 20% to .75%, molybdenum from 05% to .20%, chromium from 16.0% to 25.0%, silicon from 1.0% to 1.0%, and carbon in an amount not exceeding .10%.

8. A resistant-surface alloy of iron comprising, in combination with the iron, copmolybdenum from 05% to .12%, chromium from 16.0% to 20.0%, silicon from 1.0% to 2.5%, and carbon from 03% to 07%.

9. A resistant-surface alloy of iron comprising, in combination with the iron, chro mium from 3.0% to 300%, silicon from 50% to 6.0%, copper from .10% to 2.0%, molybdenum from 05% to 35%, and vanadium in an appreciable amount not eXceed-' ing .50%.

10. A resistant-surface alloy of iron comprising, in combination with the iron, copper from .15% to 2.0%, molybdenum from 05% to 35%, chromium from 5.0% to 25.0%, silicon from 50% to 5.0%, carbon in an amount not exceeding 20%, and vanadium in an appreciable amount not exceeding 50%.

In testimony whereof, I have signed my name to this specification this third day of April, 1924.

GEORGE H. CHARLS. 

